Hi all, I'd appreciate responses from AMD/ATI owners with crossfire configs (because they're very relevant and will keep the issue in controllable parameters). I've now got two 7970's running in crossfire and apart from some weird tubing arrangements for my water loop (res - pump - 120.4 rad - cpu - gfx2 - 120.1 rad - gfx1 - res) it's all quite nice. My cards (factory OC'd) are running at 1010 & 1050 core, temps get to 50-55 with low rpm fans. I can get zero core to work but even though crossfire is enabled, I need to disable then re-enable it (crossfire) in CCC to make zero-core work so the 2nd card shuts off completely when outside gaming. So that's all cool. But if i restart my PC i need to do the whole 'disable, re-enable' to make zero core work - it doesn't survive PC reboots or power downs? Also, with zero core, Afterburner stops registering the 2nd gpu's temp and clocks but will still display usage. So: On reboot, crossfire works fine but zero core doesn't. I need to disable crossfire then enable it again to make zero-core work. With zero-core on Afterburner doesn't register the 2nd gpu's core or temp. And launching gpu-z just freezes my system now (but my workaround is that i don't use gpu-z much). Any help on the zero-core problem (i.e., keeping it on). I figure there's a regedit ULPS answer coming up and maybe my two factory overclocked BIOS. Any insight appreciated.